Dental handpiece maintenance machine



FIG. 1 is a front view of a dental handpiece maintenance machine of the present design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines shown in the drawings represent portions of the dental handpiece maintenance machine that form no part of the claimed design. 

CLAIM The ornamental design for a dental handpiece maintenance machine, as shown and described. 